JPS59201860A - Device for manufacturing flitch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a flitch manufacturing apparatus.

[Background technology]

Conventionally, a flitch is formed between an upper mold 1 having a convexly curved mold surface and a lower mold 2 having a mold surface corresponding to the mold surface of the upper mold 1, as shown in FIG. It is manufactured by inserting a laminate 3 in which a plurality of wood veneers are laminated via an adhesive, and pressurizing (compressing) it with an upper mold 1 and a lower mold 2. The flitch manufactured in this way is made into a decorative veneer by slicing it parallel to the laminated surface. However, with this method, when the laminate 3 is pressed between the upper mold 1 and the lower mold 2, the adhesive does not harden easily, so it has been devised to apply high-frequency dielectric heating during the pressing. It has already been implemented in some places. Zunawaji has an anode and a cathode in the upper mold 1 and lower mold 2, respectively, and inserts a plurality of wooden veneers divided into appropriate numbers between them, and presses them while applying high-frequency dielectric heating. The small pieces are made into a laminate (referred to as a "book"), and the books are sequentially stacked to form a predetermined flitch. Flitching of this book is performed as shown in FIG. That is,
A certain book 4 is placed on the lower die 5, and another book 4 is placed on top of it.
are piled up with an adhesive layer 6 interposed therebetween, and when pressed by an upper mold 7 which serves as an anode for high frequency dielectric heating and a lower mold 5 which merely acts as a stamp, a cathode plate for high frequency dielectric heating is placed on the side surface of the book 4. 8, and at the same time as pressing, a high frequency is applied between the anode 7 and the cathode plate 8 to dielectrically heat the adhesive layer 6 to accelerate curing.
Further, a new book 4 is placed on top of it via the adhesive layer 6, and the abutment position of the cathode plate 8 is changed upward, and the books 4 are cured in the same manner as above, thereby sequentially laminating and bonding the books 4. ing. That is, in order to effectively dielectrically heat the adhesive layer 6 to which a new book 4 is bonded when stacking and bonding the books 4 one after another, the cathode plates 8 are disposed on the sides, and the cathode plates 8 are disposed on the upper and lower sides. It is configured so that it can be moved to However, when high frequency is applied by bringing the cathode plate 8 into contact with the side surface of the book 4 in this way, the electric field strength becomes strong near the cathode plate 8 and weakens further away from the cathode plate 8. Before the center part A of the adhesive N6 reaches the target temperature (70 to 90°C), the temperature at the end part B rises to 100'C or more, causing problems such as poor adhesion and deformation. Ta.

[Purpose of the invention]

The present invention aims to reduce such temperature differences.

[Disclosure of the invention]

This invention comprises an upper mold whose mold surface is curved in a convex shape and serves as an anode of a high-frequency electrode, a lower mold which has a concave curved surface corresponding to the mold surface of the upper mold, and an upper mold and a lower mold. A flitch manufacturing apparatus is provided with a pair of high-frequency electrode cathode plates that abut on opposite sides of a laminate of material veneers provided between the upper die and the lower die and pressurized by the upper die and the lower die, the above-mentioned pair of A feature of this device is that opposing surfaces of the high-frequency electrode cathode plate are covered with a sheet-like dielectric material.

In other words, by covering the opposing surfaces of the pair of high-frequency electrode and cathode plates with a sheet-like dielectric, the difference in electric field strength between the ends and the center of the adhesive layer of the laminate of material veneers is reduced, and the temperature The difference becomes smaller.

Next, the present invention will be explained based on examples.

That is, in this flitch manufacturing apparatus shown in FIG. 2, opposing surfaces of a pair of cathode plates 8 are covered with a sheet-like dielectric material. The other parts are the same as those in FIG. To explain in more detail, each of the pair of cathode plates 8 is composed of a plate-shaped aluminum plate as shown in FIG. The sheet-like dielectric material 10 covered with the sheet-like dielectric material 10 has a dielectric characteristic value of a dielectric constant ε-2 to 3. It is preferable to use a dielectric loss angle tan δ-2X10-2 to 4XIO-2.

As such, for example, a silicone rubber sheet with a thickness of 21 fl (f = 3 x 10"Ilz, ε = 2
．． 8. tan δ-3,0x10-2) and a polyfluoroethylene sheet with a thickness of IH (at f=3x109Hz, ε-2,0, tan δ-1,5xlO-').

Next, several books (each book consists of 100 pieces of agathis dyed veneer with a moisture content of 20 to 40 wt%) are produced using a flitch manufacturing apparatus using a silicone rubber sheet or a polyfluoroethylene sheet as the sheet-like dielectric material 1o. The sheets were laminated and high-frequency dielectric heating was applied for 1.5 minutes at 10Kw, 3.5 minutes at 5Kw, and pressed at a pressure of 9 kg/ca) into flitching (high-frequency dielectric heating at 7.5Kw for 15 minutes,
2. F1w 3.5 minutes, clamping pressure 9 kg/ctA)
The temperatures at the edges B and center A of the adhesive layer were investigated and compared with those of a conventional device under similar conditions and are shown in the following table. In addition, in these devices, as shown in FIG. 5, the distance between the line connecting the upper ends of the pair of cathode plates 8 and the bottommost part of the adhesive layer 6 to which the new book 4 is bonded is set to 30 squares. did.

From the above table, it can be seen that according to the device according to the present invention, the temperature difference between the end portion B and the center portion A of the adhesive layer 6 is smaller than that of the conventional example. In addition, according to the device according to the invention, since the temperature at the end B of the adhesive layer 6 becomes low, it is possible that the adhesive may seep out during pressing and contaminate the cathode plate 8. However, such a case can be dealt with simply by replacing the dielectric 10 covering the cathode plate 8.

Note that the flitch manufacturing apparatus of the present invention may not be used to stack and bond pre-made books as described above, but may be configured to sequentially stack and bond the books while making the books using this device to form a flitch. .

〔Effect of the invention〕

Since the flitch manufacturing apparatus of the present invention is configured as described above, it is possible to obtain a flitch without poor adhesion or deformation.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a conventional example, FIG. 3 is a configuration diagram of an embodiment of the present invention, and FIG. 4 is an enlarged view of the cathode plate.
FIGS. 5 to 8 are explanatory diagrams of the state of use thereof. 4... Book 5... Lower mold 6... Adhesive layer 7
...Upper mold 8...Cathode plate 10...Dielectric agent Patent attorney Takeshi Matsumoto Syllable 1 Figure 2 Figure b

Claims (4)

[Claims] (1) An upper mold whose mold surface is curved in a convex shape and serves as an anode of a high-frequency electrode, a lower mold which has a concave curved mold surface corresponding to the mold surface of this upper mold, and an upper mold and a lower mold. A flitch manufacturing apparatus comprising a pair of high-frequency electrode and cathode plates abutting opposite sides of a stack of small material plates provided between the upper and lower molds and pressurized by the upper mold and the lower mold, A flitch manufacturing device characterized in that opposing surfaces of a high-frequency electrode cathode plate are covered with a sheet-like dielectric material. (2) The flitch manufacturing apparatus according to claim 1, wherein the high-frequency electrode cathode plate is made of an aluminum plate. (3) The dielectric property value of the sheet-like dielectric material is
Production of a flitch according to claim 1 or 2, in which the dielectric constant ε-2 to 3 and the dielectric loss angle tan δ-2X10-2 to 4. Device. (4) The method for producing a flitch according to claim 1 or 2, wherein the sheet-like dielectric material is a silicone rubber sheet or a polytetrafluoroethylene sheet.